Laboratory Methods of Inorganic Chemistry, 2nd English Ed. 1928

HYDROXYLAMINE SULPHATE 157

and these substances interact to form hydroxylamine sulphate,
and neutral sodium sulphate. The presence of barium chloride favors this
reaction, since the sulphate ions are thereby precipitated as fast as they are
formed. The filtrate then contains, in addition to free hydrochloric acid
only hydroxylamine hydrochloride, HONH 2 -HC1, and sodium chloride, and
these can be separated by means of alcohol.
Hydroxylamine is of great importance in organic chemistry, where it is
used both as a reducing agent and as a reagent for the carbonyl groups of
aldehydes and ketones:

(CH 3 ) 2 C;O + H 2 ;NOH = (CH 3 ) 2 C :NOH + H 2 O.

acetone acetone-oxime

Hydrazine (No. 122) and semicarbazid (No. 123) show a similar behavior:

(CH 3 ) 2 CO + H 2 NNH 2 = (CH 3 ) 2 C : N-NH 2 + H 2 O

hydrazine acetone-hydrazone

2 (CH 3 ) 2 CO + H 2 N-NH 2 = (CH 3 ) 2 C : N-N: C(CH 3 ) 2 + 2 H 2 O

acetone-azine

(CH 3 ) 2 CO + H 2 N-NH-CO-NH 2 = (CH 3 ) 2 C : N-NHCONH 2 +H 2 O

semicarbazide acetone-semicarbazone

Saturate a solution of 143 g. crystallized sodium carbonate in

100 c.c. water with sulphur dioxide (from 150 g. copper and 600 g.

concentrated sulphuric acid). Cool the solution to 0° with ice and

salt, add 300 g. pulverized ice and then with mechanical stirring

allow a solution of 60 g. of sodium nitrate in 100 c.c. water to drop

in slowly. Finally add 50 c.c. of glacial acetic acid.

Place the solution in a round-bottomed flask, and heat it to

boiling upon a Babo funnel. To the boiling liquid add a hot

solution of barium chloride (about 250 g. of the crystallized

salt in 300 c.c. water), avoiding an appreciable excess, until a

little of the solution on being filtered is found free from sul-

phate. The duration of this operation is about one hour.

Allow the liquid to settle, filter and evaporate the filtrate, at first

over a free flame and finally to dryness on the water bath. Break

up frequently the crusts of salt which are formed, and draw them

up on to the sides of the dish. Place the anhydrous residue in a

flask and extract it three times by boiling it with alcohol, using

200, 100, and 50 grams respectively of the latter; evaporate the

alcoholic filtrate to a small volume, allow the solution to cool

completely, collect the crystals on a filter, and evaporate the cold

mother-liquor to obtain more crystals. Recrystallize the crude